Accession Number : AD0809106

Title :   INTERFERENCE REDUCTION TECHNIQUES FOR MIXERS.

Descriptive Note : Interim rept.,

Corporate Author : GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION

Personal Author(s) : Donaldson, E. E., Jr. ; Warren, W. B., Jr

Report Date : MAR 1967

Pagination or Media Count : 106

Abstract : The report describes a study of methods for controlling the interference susceptibility of mixers in communications receivers. The effects of several mixer characteristics which influence spurious product formations are discussed, including temperature, bias, and impedance effects. The dependence of spurious response levels on local oscillator drive is also considered, as a function of both local oscillator level and waveshape. A number of mixing techniques which provide control of spurious response levels are presented. A frequency-modulated oscillator is shown for which accurate prediction of response levels can be realized. The use of negative feedback in reducing mixer-generated interference is demonstrated for a transistor mixer. The application of a square wave local oscillator signal is shown to be effective in reducing the levels of responses associated with harmonics of the input signal. (Author)

Descriptors :   *NOISE(RADIO)), (*MIXERS(ELECTRONICS), (*RADIO INTERFERENCE, MIXERS(ELECTRONICS)), REDUCTION, CRYSTAL MIXERS, SUPPRESSORS, OSCILLATORS, FREQUENCY MODULATION, FEEDBACK, WAVEFORM GENERATORS, FREQUENCY CONVERTERS, COMMUNICATION EQUIPMENT.

Subject Categories : Electrical and Electronic Equipment
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE